14 PATHOLOGY [Bot. Absts. 



Kept. 1916: 39-40) . Various substances were applied to the soil about the middle of April and 

 3 weeks later carrot seed was planted (carrots are said to be equally susceptible to the disease) . 

 There was no interference with germination in any case. Application of the fungicides after 

 the fungus presumably has entered the vegetative state is thought to be advantageous. 

 In the table those materials shown as not tested a second time did not give promise of success. 

 Treatment of soil bearing a perennial crop like asparagus is under investigation. — D. 

 Red dick. 



97. Beach, Walter S. The Fusarium wilt of China aster. Rept. Michigan Acad. Sci. 

 20: 282-307. PI. 18-22. 1918.— A disease of China aster is described which causes a damping 

 off of seedlings and a wilting of older plants. A species of Fusarium related to F. congluti- 

 nans Wollenw. was isolated from diseased tissue and its pathogenicity on the aster proved. 

 It differs from the above-named species, however, in several slight morphological characters 

 and in its ability to produce a disease in cabbage. On the other hand F. conglutinans produced 

 a wilting of China asters in one set of experiments, but not typical of the wilt disease here de- 

 scribed. The name F. conglutinans var. callistephi n. var. is proposed for the aster fungus. 

 It is thought that the fungus is disseminated on the seed but having once been introduced 

 into a new field it persists in the soil. [See Bot. Absts. 2, Entry 624.] — W. H. Burkholder. 



98. Butler, E. J. The rice worm (Tylenchus angustus) and its control. Mem. Dept. 

 Agric. India (Bot. Ser.) 10: 1-37. Fig. 1-4. 1919.— A large area, comprising six million acres 

 of rice land in Bengal, is infected with the disease, locally known as "ufra" which has been 

 found to be due to the nematode, Tylenchus angustus. It is stated that no plant disease, ex- 

 cept the cereal rust, has done such great damage. The nematode feeds exclusively on living 

 rice. Its control is more of an agricultural problem than a pathological one. It is shown that 

 the destruction of the stubble of the winter rice will alone effect a great improvement. This 

 together with thorough cultivation of the soil before sowing destroys the worm. — J. J. 

 Skinner. 



99. Conradi, A. F., and H. W. Barre. Orchard Spraying. South Carolina Agric. Exp. 

 Sta. Ext. Circ. 17. 8 p. 1919. 



100. Cotton, A. D. Apple canker (Nectria ditissima). Jour. Bd. Agric. [London] 24: 

 1263-1266. * fig. 1918. 



101. Davis, W. H. The aecial stage of alsike clover rust. Proc. Iowa Acad. Sci. 24: 461- 

 477. 1917 (1918).— See Bot. Absts. 3, Entry 353. 



102. Eriksson, Jakob. Zur Entwickelungsgeschichte des Spinatschimmels (Peronospora 

 spinaciae (Grew.) Laub.) [Life history of P. spinaciae.] Ark. for Bot. 15 15 : 1-25. PL 4, 3 fig. 

 1918. 



103. Ferdinandsen, C. S., (Mrs.) S. Rostrup, and F. K. Ravn. Oversigt over Land- 

 brugsplanternes Sygdomme i 1917. [Report on diseases and pests in farm crops 1917.] Tidskr. 

 Planteveal 25: 314-340. Kjobenhavn, 1918. — In this 34th annual report from Denmark is 

 mentioned 69 plant diseases. Stripe disease of barley has been prominent; on the Prentice 

 variety, which is otherwise very resistant, was recorded 5 to 25 per cent plants diseased. The 

 foot disease caused by Fusarium culmorum and other species, has been very common in the 

 cereals due partly to moist weather at the harvest of 1916, partly to a very cold winter followed 

 first by a cold and wet spring, and then by a very intensive drought.' — Crowngall (Bact. tume- 

 faciens) is recorded from fodder beets, sugar beets and fodder-sugar beets, but has been of no 

 economic importance. Mosaic on beets has been harmful in the seed-producing districts, where 

 cases with 50 per cent or more arc reported. — -The late blight of potatoes (Phylophthora in- 

 festans) appeared rather late, but still the bordeaux spraying gave good returns. Verticillium 

 wilt ( V. (dboatrum) is recorded for the first time. Leaf roll of potatoes was conspicuous in the 

 dry summer, and on one field hardly one plant was free; in a variety test at one of the experi- 

 ment stations, seedlings have been badly attacked. — A single case of crowngall of alfalfa 

 (Urophlyctis alfalfae) was found, the first in the country. Corn smut (U. maydis), which 

 was found on corn grown in a garden, is also new. — Ernst Gram. 



